THANX for the comments everybody!
Boys, boys...

I can't settle your debate of Town Car v Suburban, but I can tell you that I am sure a TC will be fine for us. As I said in my OP, it's just me & DGD this trip. So my main concerns are safety and the availability of someone to help with baggage since I may still be using a crutch.
Got Quattro? I'm glad to hear that you've had experience with this airport and with
FL Tours. You are from my area - STL (GO CARDS!) So I assume you flew out of MidAmerica also. I've only used Lambert to MCO, but I couldn't resist that $59 fare.
Sandi - There is a link to FL Tours on this site. You can reserve on line and I felt comfortable doing so since they don't ask for credit card info. You either pay cash at the time or you can call in your cc info a few days before - which I will do if I stick with them. I thought they were a little pricey - $229 round trip includes all fares and grocery stop but not gratuity. At 20%, that means about $275 total - which is more than my bargain air fare! I don't mind paying a little extra if they're safe and reputable, don't want to be stuck in a small airport with a child late in the evening. But I'm still shopping around...